John b



(No Model.) v J. B. OLD'IBRSHAW,

HEATING STOVE.

No. 268,718, I Patented so. 5, 1882. ||E I- --r-us 15-" ilhogmpher.Wnhington n c f UNITED STATES PATENT OFFICE.

JOHN B. OLDERSHAW, OF BALTIMORE, MARYLAND.

H EATING-STOVE.

- SPECIFICATION forming part of Letters Patent No. 268,718, datedDecember 5,1882,

Application filed August 14, 1882. (No model.)

To all whom it may concern Be it known that I, JOHN B. OLDERSHAW, of thecity of Baltimore, in the State of Mary- ]and, have invented certainImprovements in Stoves,of which the following isaspecification.

The object of' this-invention is to increase the heating capacity of astove and to equalize the temperature in all parts of the room in whichthe stove is situated.

In carrying out my invention, as hereinafter fully described, I providethe stove with an air-duct having its inlet end near the bottom of thestove and its outlet end terminating in a hot air chamber covered by aperforated plate situated over the magazine. The coldest stratum of airin the room, which is necessarily on the floor, enters the air-duct,becomes heated, passes to the hotair chamber, and thence through theperforated cap-plate again to the room. By this means thehot air in .theroom is gradually depressed to take the place of the colder body whichrises through the duct, as described. The result of this circulatingmovement of air is the gradual equalization of tem- 2 perature of thewhole body of air in the apartment. I

In the further description of my invention which follows, reference ismade to the accompanyingdrawings, forming a part hereof, and

0 in which- Figures I and II are respectively an exterior and asectional "iew of the improved stove, iookingfrom the same point. Fig.III is a top view of Fig. I; and Fig. 1V is a section of Fi 5 II, takenon the dotted line my.

Similar letters of reference indicate similar parts in all the views. a

A is the casing of the stove, and B is the a grate.

0 i O is the fire-chamber, and D the ash-receptacle, in which theash-pan a is situated.

E is the magazine, having a feed-opening, b, and c is the exteriorfeed-door in the casing of the stove, opposite to the opening b. The top5 of the magazine has a small aperture, cl, for

the escape of gases to the fire-chamber G.

F is thehot-air chamber, which is considerably less in diameter than theupper section of the casing A, in order to forman annular space, 0, fromwhich the stove-pipe f extends. The hot-air chamber is surmounted by anornamental perforated cap plate, G, through which heated air escapes tothe room.

The air-duct is represented by H, and it may be formed either by part ofthe casing A, as shown in the drawings, or by an independent pipe. Ineither case it discharges air to the interior of the hot-air chamber, asshown in the drawings.

In Fig. 11 the direction of movement of the Go gases and other productsof combustion is indicated by arrows in broken lines, and that of theair by arrows in full lines.

The stove is provided with the usual doors and other necessary devices;but these are of ordinary design and need no special description herein.

It will be seen that the heated gases and smoke, in their passage to theannular space around the hot-air chamber, strike against the under sideor bottom of the said chamber, and the air therein is thereby heated tosome ex tent independently of the hot-air duct. By this means a morerapid movement of air is effected than if the circulation were causedby: 7 5

rarefaction in the duct alone.

I claim as my invention In a stove, the combination of a fire-chamher,amagazine situated within the said firechamber, with a space around andover it for the exit of gases and other products of cornbustion, ahot-air chamber or reservoir suspended over the said magazine andseparated by a space from it, and having an annular inclosed spacearound it, into which the said 8 gases are delivered before beingdischarged to the smoke-pipe, and provided with a perforated cover and aduct or pipe to carry air from near the bottom of the stove to the lowerpart of the said hot-air chamber, substantially as and for the purposespecified.

JOHN B. OLDERSHAW.

Witnesses E1). J. Dress,

WM. '1. HOWARD.

